PCI Express Terms and Acronyms (Five)

End-End TLP Prefix A TLP Prefix that is carried along with a TLP from source to destination. See
Section 2.2.10.2.
Endpoint One of several defined System Elements. A Function that has a Type 00h
Configuration Space header.
error detection Mechanisms that determine that an error exists, either by the first agent to
discover the error (e.g., Malformed TLP) or by the recipient of a signaled error
(e.g., receiver of a poisoned TLP).
error logging A detector setting one or more bits in architected registers based on the
detection of an error. The detector might be the original discoverer of an error or
a recipient of a signaled error.
error reporting In a broad context, the general notification of errors. In the context of the Device
Control register, sending an error Message. In the context of the Root Error
Command register, signaling an interrupt as a result of receiving an error
Message.
error signaling One agent notifying another agent of an error either by (1) sending an error
Message, (2) sending a Completion with UR/CA Status, or (3) poisoning a TLP.
Extended Function Within an ARI Device, a Function whose Function Number is greater than 7.
Extended Functions are accessible only after ARI-aware software has enabled
ARI Forwarding in the Downstream Port immediately above the ARI Device.
FetchAdd Fetch and Add. An AtomicOp where the value of a target location is incremented
by a specified value using two’s complement arithmetic ignoring any carry or
overflow, and the result is written back to the location. The original value of the
location is returned.
Flow Control The method for communicating receive buffer status from a Receiver to a
Transmitter to prevent receive buffer overflow and allow Transmitter compliance
with ordering rules.
FCP or
Flow Control Packet A DLLP used to send Flow Control information from the Transaction Layer in one
component to the Transaction Layer in another component.
Function An addressable entity in Configuration Space associated with a single Function
Number. May be used to refer to one Function of a multi-Function device, or to
the only Function in a single-Function device.
Function Group Within an ARI Device, a configurable set of Functions that are associated with a
single Function Group Number. Function Groups can optionally serve as the
basis for VC arbitration or access control between multiple Functions within the
ARI Device.